Alert archive / Alabama / Flash Flood Warnings in 2011

Flash Flood Warning 26, NWS Birmingham, AL

June 27, 2011Jefferson County, Alabama

NWS Birmingham, AL issued this flash flood warning at Jun 27, 2011, 4:25 PM CDT for Jefferson County, Alabama. It was in force for 2 hr. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jun 27, 2011, 4:25 PM CDT (21:25 UTC)
Expired: Jun 27, 2011, 6:27 PM CDT
In force: 2 hr
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Flood severity: None

County Jefferson County, AL

The radar

The Birmingham radar (KBMX), 33 km from the middle of the area, began a volume at 21:28 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
Jun 27, 4:51 PM CDT	FLASH FLOOD	4 E Homewood, AL	3-6 INCHES OF WATER FLOWING OVER GREEN VALLEY ROAD.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 9.4 hours before the alert went out and 32 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 2462 J/kg
Mixed-layer CIN: -52 J/kg
Mixed-layer LCL: 712 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: -54 m²/s²
0-3 km storm-relative helicity: -1 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -2.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

863 
WGUS54 KBMX 272125
FFWBMX
ALC073-280030-
/O.NEW.KBMX.FF.W.0026.110627T2125Z-110628T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
425 PM CDT MON JUN 27 2011

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL JEFFERSON COUNTY IN ALABAMA...

* UNTIL 730 PM CDT

* AT 424 PM CDT...TRAINED WEATHER SPOTTERS REPORTED SLOW MOVING      
  THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. 1   
  TO 2 INCHES HAVE ALREADY FALLEN.  ANOTHER 1 TO 2 ARE POSSIBLE OVER 
  THE NEXT HOUR.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  BIRMINGHAM...HOMEWOOD...IRONDALE...MOUNTAIN BROOK...VESTAVIA
  HILLS...B.J.C.C....CAHABA HEIGHTS...KINGSTON...SAMFORD UNIVERSITY
  AND U.A.B. CAMPUS.

FLOODING IN THE AREAS OF SICARD HOLLOW ROAD AND BLUE LAKE DRIVE IN 
JEFFERSON COUNTY.  PLEASE AVOID DRIVING IN THIS AREA.

TO REPORT SEVERE WEATHER...
CALL 1-800-856-0758.

LAT...LON 3347 8664 3347 8667 3346 8668 3345 8669
      3343 8671 3340 8675 3339 8684 3354 8682
      3355 8663

$$

27

2 follow-up statements

056 
WGUS74 KBMX 272145
FFSBMX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
445 PM CDT MON JUN 27 2011

ALC073-280030-
/O.CON.KBMX.FF.W.0026.000000T0000Z-110628T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
JEFFERSON AL-
445 PM CDT MON JUN 27 2011

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR CENTRAL JEFFERSON COUNTY
UNTIL 730 PM CDT...

AT 445 PM CDT...WEATHER SPOTTERS REPORTED THUNDERSTORMS WITH VERY 
HEAVY RAINFALL ACROSS THE WARNED AREA. 2 TO 3 INCHES OF RAIN HAS 
FALLEN IN THE LAST 45 MINUTES ACROSS THIS AREA.

RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLASH FLOODING INCLUDE...
BIRMINGHAM...HOMEWOOD...IRONDALE...MOUNTAIN BROOK...VESTAVIA HILLS...
B.J.C.C....CAHABA HEIGHTS...KINGSTON...SAMFORD UNIVERSITY AND U.A.B.
CAMPUS.

THERE ARE REPORTS OF SIGNIFICANT FLOODING IN AND AROUND CAHABA 
HEIGHTS.  PLEASE AVOID THIS AREA IF AT ALL POSSIBLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A VERY DANGEROUS AND LIFE THREATENING FLOODING SITUATION. YOU
SHOULD NOT ATTEMPT TO TRAVEL. STAY HOME UNLESS YOU ARE FORCED TO
EVACUATE TO HIGHER GROUND.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.

&&

LAT...LON 3347 8664 3347 8667 3346 8668 3345 8669
      3343 8671 3340 8675 3339 8684 3354 8682
      3355 8663

$$

27

829 
WGUS74 KBMX 272327
FFSBMX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
627 PM CDT MON JUN 27 2011

ALC073-272342-
/O.CAN.KBMX.FF.W.0026.000000T0000Z-110628T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
JEFFERSON AL-
627 PM CDT MON JUN 27 2011

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR CENTRAL JEFFERSON
COUNTY IS CANCELLED...

EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA. STREAMS
AND CREEKS IN THE WARNED AREA HAVE RECEDED OR WERE BEGINNING TO
RECEDE...ENDING THE FLOOD THREAT. IF FLOODING HAS BEEN OBSERVED...
PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY.

LAT...LON 3347 8664 3347 8667 3346 8668 3345 8669
      3343 8671 3340 8675 3339 8684 3354 8682
      3355 8663

$$

27

The office that day

Everything else NWS Birmingham, AL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 26, 7:05 PM CDT	Special Weather Statement	BMX	Bullock, Lee, Lowndes, Montgomery, Pike, Russell	40 min
Jun 26, 7:32 PM CDT	Areal Flood Advisory	BMX	Russell	118 min
Jun 26, 8:03 PM CDT	Special Weather Statement	BMX	Barbour	27 min
Jun 27, 5:20 AM CDT	Special Weather Statement	BMX	Bullock	40 min
Jun 27, 3:15 PM CDT	Special Weather Statement	BMX	Chambers	45 min
Jun 27, 3:36 PM CDT	Special Weather Statement	BMX	Chambers	39 min
Jun 27, 3:38 PM CDT	Special Weather Statement	BMX	Shelby	52 min
Jun 27, 4:05 PM CDT	Areal Flood Advisory	BMX	Jefferson	2 hr
Jun 27, 4:10 PM CDT	Severe Thunderstorm Warning	BMX	Jefferson, Shelby	37 min
Jun 27, 4:20 PM CDT	Special Weather Statement	BMX	St. Clair	40 min
Jun 27, 4:33 PM CDT	Special Weather Statement	BMX	Pike	27 min
Jun 27, 4:38 PM CDT	Special Weather Statement	BMX	Barbour	37 min
Jun 27, 6:51 PM CDT	Special Weather Statement	BMX	Barbour	39 min

Nearby

Flash Flood Warnings in Alabama, 2011 Every flash flood warning in 2011

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.